EM-5 Setting changes

I've just bought a secondhand EM-5 and I've been playing around with the multitude of settings available. The problem is is that I keep finding the settings reverting back to the previous seeing. As an example, I'll set the colour space to sRGB and this setting will appear to be set. When I turn the camera off and turn the camera back on the camera will have reverted back to Adobe. This had happened with a number of the settings that I've changed.